From: Bernd.Specht@gmx.com (Bernd Specht)
Subject: Re: Bitmanipulation in Ada
Date: 19 Aug 2004 17:44:05 GMT
Date: 2004-08-19T19:44:05+02:00 [thread overview]
Message-ID: <Xns954AC8912E35DBerndSpechgmxcom@151.189.20.10> (raw)
In-Reply-To: wSSUc.27249$9Y6.977@newsread1.news.pas.earthlink.net
Jeffrey Carter <spam@spam.com> wrote in news:wSSUc.27249$9Y6.977
@newsread1.news.pas.earthlink.net:
> Bernd Specht wrote:
> That may be what you want. What a software engineer wants is the
> clearest software that meets the requirements. Unchecked_Conversion will
> almost always provide this.
Sure.
> In many cases, Unchecked_Conversion will generate no code, and need not
> involve an assignment. In well designed software, the part(s) of the
> software that deals with values as an integer and those that deal with
> them as bit arrays will be kept separate. So you do something like:
Always? What do you think about bitscrambling software which has to treat
data alternating as bitvector and as integer value in a loop like this (not
exeactly this for securitity reasons):
...
loop
declare
x : boolean;
begin
x := b(k);
b(k) := b(32 - k);
b (32 - k) := x;
I := I * prime1 mod prime2;
end;
end loop;
Can you find an equivalent algorithm where you can separate the bit-ops and
the integer-ops?
next prev parent reply other threads:[~2004-08-19 17:44 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-18 20:37 Bitmanipulation in Ada Bernd Specht
2004-08-18 20:51 ` Ludovic Brenta
2004-08-18 21:10 ` Bernd Specht
2004-08-18 21:16 ` Ludovic Brenta
2004-08-18 21:18 ` Ed Falis
2004-08-19 17:30 ` Bernd Specht
2004-08-19 17:44 ` Ed Falis
2004-08-19 0:53 ` Jeffrey Carter
2004-08-19 17:44 ` Bernd Specht [this message]
2004-08-19 18:09 ` Martin Dowie
2004-08-19 18:28 ` Bernd Specht
2004-08-19 19:31 ` Martin Dowie
2004-08-19 20:29 ` Martin Dowie
2004-08-20 21:31 ` Bernd Specht
2004-08-19 19:17 ` Jeffrey Carter
2004-08-19 19:57 ` Björn Persson
2004-08-20 0:52 ` Jeffrey Carter
2004-08-19 21:24 ` Francois G. Dorais
2004-08-20 8:55 ` Pascal Obry
2004-08-20 7:26 ` Jean-Pierre Rosen
2004-08-20 21:20 ` Bernd Specht
2004-08-20 21:39 ` Ed Falis
2004-08-18 21:14 ` (see below)
2004-08-18 21:56 ` Martin Dowie
2004-08-19 15:25 ` (see below)
2004-08-19 15:50 ` Martin Dowie
2004-08-18 21:53 ` Martin Dowie
2004-08-18 22:59 ` Björn Persson
2004-08-19 8:08 ` Egil H. H�vik
2004-08-19 17:46 ` Bernd Specht
2004-08-20 20:57 ` Bitordering? was " Alfred Hilscher
2004-08-21 11:34 ` Nick Roberts
2004-08-21 14:00 ` Jim Rogers
2004-08-21 16:54 ` Simon Wright
2004-08-21 16:55 ` Georg Bauhaus
2004-08-23 18:36 ` Alfred Hilscher
2004-08-23 18:47 ` Alfred Hilscher
2004-08-23 22:39 ` Nick Roberts
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